spectrum

Pronunciation

• (Canada) (UK) IPA ^(key): /ˈspektrəm/
• (US) IPA ^(key): /ˈspɛkt(ʃ)rəm/

• Audio (UK)

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Noun

Singular spectrum

Plural spectra or spectrums

A spectrum of colors

1. A range.
2. Specifically, a range of colors representing light of various frequencies.
3. (chemistry) The pattern of absorption or emission of radiation that is made by a substance when it is put in contact with an energy such as radiation, heat, electricity, etc.